Sampling methods

selecting a representative sample from a target population and then generalising from the results of the study.

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why do we use sampling?

We use sampling as we cannot study everyone in our target population.

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what are the three methods of sampling?

random, voluntary and opportunity

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what is the definition of random sampling?

Every member of the target group has a equal chance of being selected

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what is the definition of voluntary sampling?

People actively volunteer to the study by responding to advertisement

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what is the definition of opportunity sampling?

Participants that are available and willing to be studied

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what are the advantages and disadvantages of random sampling?

advantages: unbiased- all members have equal chance, quck and easy....... Disadvantages: cannot guarentee a representative sample

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what are the advantages and disadvantages of voluntary sampling?

advantages: wide variety of participants, allow in depth study more accurat, mopre representative sample...... Disadvantages; biased as it people are more motivated to do the study and can have more time

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what are the advantages and disadvantages of opportunity sampling?

advantages: easy and quick, takes less time..... Disadvantages: unlikley to be representative of the target population